Kapla is a construction set for children and adults. The sets consist only of identical wood planks measuring 11.7 cm x 2.34 cm x 0.78 cm. This 15:3:1 ratio of length:width:thickness is different than the dimensions used for traditionally proportioned building blocks (such as unit blocks), and are used for building features such as lintels, roofs and floors. They are known for their stability in the absence of fastening devices. Name origin. "KAPLA" is an abbreviated form of the Dutch phrase "kabouter plankjes," which means "Gnome Planks." History.
https://en.wikipedia.org/wiki/Kapla